Main-grid-free battery testing device

Abstract

The utility model relates to the technical field of battery testing, in particular to a main-grid-free battery testing device which comprises a testing base, the testing base comprises an elastic base station capable of elastically deforming, and the upper surface of the elastic base station is of a three-dimensional curved surface structure which is arched upwards in the direction from the periphery to the middle of the elastic base station. A plurality of contact test points used for forming ohmic contact with fine grid lines on a battery to be tested are arranged on the elastic base table, a flexible pressing and fixing mechanism capable of ascending and descending relative to the thickness direction of the test base is further arranged above the test base, and the flexible pressing and fixing mechanism comprises a pressing and fixing wire net. The pressing and fixing wire net comprises a plurality of first pressing wires parallel to one another and a plurality of second pressing wires parallel to one another, and the first pressing wires and the second pressing wires are arranged in a crossed mode to form a net structure. According to the testing device, the to-be-tested battery does not shake or displace when being pressed, the stress is more uniform, the thin grid lines at all positions can be in stable contact with the contact testing points, and the reliability of a detection result is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery test technical field especially relates to a kind of main grid-free battery testing device. BACKGROUND

[0002] In the solar cell production and research and development process, the battery piece needs to be tested for current-voltage (I-V) and electroluminescence (EL) to obtain various electrical performance parameters of the battery piece.

[0003] The battery piece is divided into main grid battery and main grid-free battery according to whether there is a main grid. In the testing process of the main grid-free battery, to ensure stable contact between each fine grid of the main grid-free battery and the test probe, it is necessary to ensure that the main grid-free battery does not displace and that the contact pressure between each fine grid and the test probe is appropriate and uniform.

[0004] The main grid-free battery is divided into main grid-free bifacial cell and main grid-free back contact cell. The main grid-free back contact cell (BC) is a new type of solar cell technology, and its core feature is that the positive and negative electrodes of the battery are completely placed on the back of the battery piece, thereby greatly improving the light utilization efficiency and photoelectric conversion efficiency.

[0005] Currently, the testing device for the main grid-free battery is more for the main grid-free bifacial cell. In one main grid-free bifacial cell testing device, a certain number of wires are arranged along the fine grid width direction of the battery to be tested on the top of the front surface of the battery to be tested, and the battery to be tested is fixed by the tensioned wires. However, this fixing method does not match the design of the main grid-free back contact cell:

[0006] 1) The current wires are only arranged in the vertical direction of the fine grid, and the fixing effect is not good. The battery to be tested is prone to shaking and displacement in the fine grid extension direction. In addition, the wires are tensioned by a spring tensioning mechanism at both ends of the wire, and the tension of the wire segment at the middle position of the battery to be tested is smaller, resulting in uneven pressure on the battery to be tested, which affects the reliability of the test results.

[0007] 2) Compared with the main grid-free bifacial cell, the positive and negative electrodes of the main grid-free back contact cell are completely placed on the back of the battery piece, the number of fine grids is larger, the spacing is narrower, and the diameter of the fine grid itself is narrow. The size of the traditional test probe is too large, and it is difficult to ensure that each fine grid is detected. INVENTION CONTENTS

[0008] The utility model aims at the existing technical situation, and provides a main grid-free battery testing device.

[0009] The test device can prevent the battery to be tested from shaking and displacement when being pressed, and the force is more uniform, and the fine grid lines at each position can be in stable contact with the contact test points, thereby ensuring the reliability of the detection result.

[0010] To achieve the above object, the utility model adopts the following technical scheme:

[0011] The utility model provides a no main grid battery test device, including test base, the test base includes the elastic base station of elastic deformation, the upper surface of elastic base station is to the three -dimensional curved surface structure of the upward arch in its four all directions to the middle direction, be equipped with a plurality of contact test points for with the fine grid line of battery to be measured ohmic contact on the elastic base station,

[0012] The upper side of the test base is also provided with a flexible pressing mechanism that can be lifted relative to the thickness direction of the test base, the flexible pressing mechanism includes a pressing line net, the pressing line net includes a plurality of first pressing lines and a plurality of second pressing lines, the first pressing lines and the second pressing lines are arranged in a cross shape to form a mesh structure.

[0013] In some embodiments, the angle alpha of the upper surface of the elastic base station relative to the horizontal plane is:

[0014] Alpha = arcsin (h / s),

[0015] In the formula, alpha is the angle of the upper surface of the elastic base station relative to the horizontal plane, 0.5 DEG ≤ alpha ≤ 6 DEG, s is the length of the line between any point on the four edges of the three-dimensional curved surface structure and the highest point of the three-dimensional curved surface structure, and h is the relative height between the plane where the four edges of the three-dimensional curved surface structure are located and the highest point of the three-dimensional curved surface structure.

[0016] In some embodiments, the elastic base station includes a base layer and a flexible circuit board stacked with each other, the upper surface of the base layer has an original form of three-dimensional curved surface structure in the form of upward arch in the middle direction of its four all directions and a deformed form of plane, the contact test points are arranged on the flexible circuit board, the flexible circuit board has a first form of plane and a second form of three-dimensional curved surface structure in the form of upward arch in the middle direction of its four all directions, and the flexible circuit board is attached to the upper surface of the base layer.

[0017] In some embodiments, the flexible pressing mechanism includes a mounting frame and an adjusting assembly arranged on the mounting frame, the adjusting assembly is used for adjusting the tension of the first pressing line and / or the second pressing line, and the mounting frame is connected with a lifting assembly for driving the mounting frame to lift along the thickness direction of the test base.

[0018] In some embodiments, the pressure solidification wire net is transparent and insulating.

[0019] In some embodiments, the grid shape of the net structure is any one of parallelogram, rectangle, square.

[0020] In some embodiments, the elastic base has vacuum adsorption holes for adsorbing the battery to be tested.

[0021] In some embodiments, the contact test point forms flat ends at both ends of the first direction, and the flat ends extend along the second direction, and the first direction and the second direction are arranged in a cross manner.

[0022] W i <d i <D i ,

[0023] In the formula, d i is the relative distance between the flat ends at both ends of the contact test point i, W i is the line width of the corresponding fine grid line on the battery to be tested, and D i is the relative distance between the corresponding fine grid line and the adjacent fine grid line adjacent to it, and the corresponding fine grid line is the fine grid line on the battery to be tested which is in contact with the contact test point i.

[0024] In some embodiments, the cross section of the contact test point is a polygon with at least two parallel sides.

[0025] In some embodiments, the cross section of the contact test point is any one of a right angle rectangle, a round corner rectangle, and a chamfered rectangle.

[0026] In some embodiments, the elastic base includes a substrate, and the contact test point at least partially protrudes from the surface of the substrate.

[0027] In some embodiments, the part of the contact test point protruding from the surface of the substrate forms a protruding part, and the height of the protruding part is at least 10 μm.

[0028] In some embodiments, the height of the protruding part is 10 μm to 300 μm.

[0029] The utility model discloses the beneficial effect lies in:

[0030] The utility model discloses, through setting up by the first pressure line and the second pressure line cross formation pressure solid line net, utilize the pressure solid line net of mesh structure and press together, fixed battery, from two directions cross fixed battery, effectively avoid the battery in the testing process and sway, displacement, simultaneously, compared to the prior art unidirectional tension fixed and the prior art only rely on the mode of vacuum hole adsorption, the pressure solid line net of mesh structure's pressure force is more uniform. On the other hand, set up the elastic base station of elastic deformation on the test base, utilize the three -dimensional curved surface structure of the elastic base station upper surface along its four around to the middle direction and arch upwards, make when pressure solid line net press together, the arching middle position can divide more force, make up the problem that the line segment of pressure solid line net in the middle position is smaller in tension, further increase the uniformity of pressure force, thereby when the battery is pressed together by the flexible pressure solid mechanism, do not sway, displacement, and each position of battery is stressed more evenly, and each position's fine grid line can be in stable contact with the contact test point, ensure the reliability of detection result, and because of the flexible characteristic of elastic base station, can avoid the problem that the traditional glass plate whole pressure is easily led to the battery of testing and breaks, protect the battery of testing.

[0031] In addition, in the utility model, the contact test point is arranged on the elastic base station, the fine grid line on the battery of testing is contacted through the contact test point, the electrical parameter information of the fine grid line is transmitted through the contact test point, the shape and size of the contact test point are more free, so that the electrical parameter information of each fine grid line can be collected through the cooperation of the pressure solid line net and the contact test point, and the test device is suitable for the battery without main grid, especially for the back contact battery without main grid. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structure schematic diagram of a battery without main grid of the utility model embodiment.

[0033] Figure 2 It is a side sectional view of a battery without main grid test device along the second direction of the utility model embodiment.

[0034] Figure 3 It is a side sectional view of a battery without main grid test device along the first direction of the utility model embodiment.

[0035] Figure 4 It is a principle schematic diagram of the elastic base station of the utility model embodiment and is pressed together as planar by three -dimensional curved surface.

[0036] Figure 5 It is a structure schematic diagram of the test base of the utility model embodiment.

[0037] Figure 6 It is a partial structure schematic diagram of the elastic base station along the second direction section of the utility model embodiment.

[0038] Figure 7 It is the local structure schematic view of the elastic base station along the first direction section of the embodiment of the utility model.

[0039] Figure 8 It is the explosion view of the base layer and the flexible circuit board of the embodiment of the utility model.

[0040] Figure 9 It is the local structure schematic view of the elastic base station along the first direction section of the embodiment of the utility model. Figure 5 It is the local structure schematic view of the elastic base station along the first direction section of the embodiment of the utility model.

[0041] Figure 10 It is the cooperation schematic view of the fine grid line of the mainless grid back contact cell testing device and the cell to be tested when testing.

[0042] Figure 11 It is the structure schematic view of the contact test point being right angle rectangle of the embodiment of the utility model.

[0043] Figure 12 It is the structure schematic view of the contact test point being inverted corner rectangle of the embodiment of the utility model.

[0044] Figure 13 It is the structure schematic view of the contact test point being round corner rectangle of the embodiment of the utility model.

[0045] Figure 14 It is the structure schematic view of the contact test point being round corner rectangle of the embodiment of the utility model.

[0046] Figure 15 It is the structure schematic view of the contact test point being irregular polygon of the embodiment of the utility model.

[0047] Figure 16 It is the local side view of the elastic base station of the embodiment of the utility model. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is further detailed in combination with the drawings and embodiment, the example of the embodiment is shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar function throughout. The embodiment described below by referring to the drawings is exemplary, only for explaining the utility model, and can not be understood as limiting the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model, and not used to limit the utility model.

[0049] In the description of the utility model, the terms "first", "second" and the like are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "a plurality of", "several" is two or more than two, unless otherwise specifically limited.

[0050] In the description of the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include that the first feature and the second feature are in direct contact, or the first feature and the second feature are not in direct contact but are in contact through another feature between them.

[0051] Referring to Figures 1 to 5 As shown in the figure, the utility model provides a kind of main grid-free battery testing device, including test pedestal 1, test pedestal 1 includes the elastic base 11 of elastic deformation, the upper surface of elastic base 11 is along its four directions to the direction of middle upward arching three-dimensional curved surface structure, a plurality of contact test points 2 for forming ohmic contact with the fine grid line 51 on the battery 5 to be measured 5 are provided on elastic base 11,

[0052] The upper side of test pedestal 1 is also provided with flexible pressure solid mechanism 3 that can be lifted relative to the thickness direction of test pedestal 1, and flexible pressure solid mechanism 3 includes pressure line net 31, and pressure line net 31 includes a plurality of first pressure lines 311 and a plurality of second pressure lines 312, and the first pressure lines 311 and the second pressure lines 312 are cross arranged to form a mesh structure.

[0053] It can be understood that the main grid-free back contact battery has oppositely arranged light receiving surface (front surface) and back light surface (back surface), wherein the light receiving surface (front surface) generally refers to the side that receives light, and the fine grid line 51 is concentrated on the back light surface (back surface).

[0054] When using, the upper surface of elastic base 11 is upward arching three-dimensional curved surface structure along its four directions to the direction of middle when flexible pressure solid mechanism 3 is not pressed, after placing the battery 5 to be measured on elastic base 11, flexible pressure solid mechanism 3 is moved downward, so that pressure line net 31 is pressed on the front surface of battery 5 to be measured, and elastic base 11 is pressed, and the plane is formed by the upward arching three-dimensional curved surface structure, so that contact test point 2 can be in contact with the fine grid line 51 on the back surface of battery 5 to be measured, to collect the current, voltage and other electrical parameters of fine grid line 51.

[0055] The utility model discloses a flexible pressure solidification mechanism 3 is provided with first pressure line 311 and second pressure line 312, and the first pressure line 311 and the second pressure line 312 are crossed and form the pressure solidification line net 31, and the pressure solidification line net 31 of mesh structure is used to press and fix the battery 5 to be measured, and the battery 5 to be measured is crossed and fixed from two directions, effectively avoids the battery 5 to be measured to shake and displace in the testing process, and simultaneously, compared with the prior art one-way tension fixing and the prior art only relying on the vacuum hole adsorption mode, the pressure solidification force of the pressure solidification line net 31 of mesh structure is more uniform.

[0056] In addition, the utility model discloses a contact test point 2 is provided on the elastic base 11, and the contact test point 2 is contacted with the fine grid line 51 on the battery 5 to be measured, so as to transmit the electrical parameter information of fine grid line 51 by the contact test point 2, and the shape and size of contact test point 2 are more free, so that the electrical parameter information of each fine grid line 51 can be collected through the cooperation of pressure solidification line net 31 and contact test point 2, and the testing device is suitable for the battery without main grid, especially the battery without main grid and back contact.

[0057] It can be understood that the extension direction of the first pressure line 311 or the second pressure line 312 can be parallel to the extension direction of the fine grid line 51 of the battery 5 to be measured, or can be arranged in a cross manner with the extension direction of the fine grid line 51 of the battery 5 to be measured.

[0058] The included angle formed by the first pressure line 311 and the second pressure line 312 can be a right angle, an acute angle or an obtuse angle.

[0059] Preferably, the extension direction of one of the first pressure line 311 or the second pressure line 312 is parallel to the extension direction of the fine grid line 51 of the battery 5 to be measured, and the other is perpendicular to the extension direction of the fine grid line 51 of the battery 5 to be measured.

[0060] In some embodiments, referring to Figure 1 , Figure 6 and Figure 7 The angle α of the upper surface of the elastic base 11 relative to the horizontal plane is:

[0061] a = arcsin(h / s),

[0062] In the formula, a is the angle of the upper surface of the elastic base with respect to the horizontal plane, 0.5°≤a≤6°, s is the length of the line between any point y on the four edges of the three-dimensional curved surface structure and the highest point x of the three-dimensional curved surface structure, and h is the relative height between the plane on which the four edges of the three-dimensional curved surface structure are located and the highest point x of the three-dimensional curved surface structure.

[0063] The greater the angle a is, the higher the bending degree of the three-dimensional curved surface structure is. When the angle a is too small or too large, the improvement effect on the uniformity of the pressing force of the battery 5 to be tested is easily affected.

[0064] In some embodiments, as shown in Figure 5 and Figure 8 The elastic base 11 includes a base layer 111 and a flexible circuit board 112 stacked with each other. The upper surface of the base layer 111 has an original form of a three-dimensional curved surface structure arched upward in a middle direction along the four edges thereof and a deformed form of a plane. The contact test point 2 is arranged on the flexible circuit board 112. The flexible circuit board 112 has a first form of a plane and a second form of a three-dimensional curved surface structure arched upward in a middle direction along the four edges thereof. The flexible circuit board 112 is conformally attached to the outside of the upper surface of the base layer 111.

[0065] By using the flexible circuit board 112, the flexible circuit board 112 is in a plane (i.e., the first form) under the condition of no external force. After the flexible circuit board 112 is prepared, it is conformally attached to the outside of the upper surface of the base layer 111, so that the flexible circuit board 112 can change with the form of the base layer 111 and become a common body. When the flexible pressing and fixing mechanism 3 is not pressed, the flexible circuit board 112 attached to the surface of the base layer 111 is in a three-dimensional curved surface structure arched upward (i.e., the original form). After the flexible pressing and fixing mechanism 3 is pressed, the base layer 111 and the flexible circuit board 112 are stressed, and their surface shapes change from the three-dimensional curved surface structure arched upward to the plane.

[0066] The elastic base 11 is composed of the base layer 111 and the flexible circuit board 112 stacked with each other. In the manufacturing process, the contact test point 2 can be formed on the flexible circuit board 112 in a plane by printing, adhesion, plating, or the like. Then, the flexible circuit board 112 is conformally attached to the outside of the upper surface of the base layer 111. The manufacturing method is simpler, and the contact test point 2 can be arranged according to the preset layout.

[0067] In some embodiments, as shown in Figures 1 to 3As shown, the flexible pressing mechanism 3 comprises a mounting frame 32 and an adjusting assembly 33 arranged on the mounting frame 32, the adjusting assembly 33 is used to adjust the tension of the first pressing line 311 and / or the second pressing line 312, and the mounting frame 32 is connected with a lifting assembly 34 used to drive the mounting frame 32 to lift along the thickness direction of the test base 1.

[0068] It can be understood that the adjusting assembly 33 can refer to the existing rope tension adjusting device, and only needs to achieve the tension adjustment of the first pressing line 311 and / or the second pressing line 312, which will not be described here.

[0069] The lifting assembly 34 can be a pneumatic cylinder, a motor lead screw assembly, a motor gear rack assembly, etc., and only needs to achieve the lifting of the mounting frame 32, which will not be described here.

[0070] In some embodiments, the pressing line net 31 is transparent and insulating, which can prevent the pressing line net 31 from blocking the front of the battery under test 5 and affecting the test results.

[0071] In some embodiments, as shown in Figure 1 The grid shape of the mesh structure is any one of parallelogram, rectangle, and square.

[0072] In some embodiments, as shown in Figure 9 The elastic base 11 is provided with vacuum adsorption holes 4 used to adsorb the battery under test 5.

[0073] Before or during the pressing of the flexible pressing mechanism 3, the battery under test 5 is adsorbed and fixed by the vacuum adsorption holes 4, thereby increasing the fixing effect on the battery under test 5.

[0074] It can be understood that in some embodiments, the vacuum adsorption holes 4 can also not be arranged on the elastic base 11, so as to omit the time for establishing and breaking the vacuum, thereby improving the detection efficiency.

[0075] In some embodiments, as shown in Figure 5 , Figures 9 to 11 The contact test point 2 is provided with flat ends 23 at both ends in the first direction, the flat ends 23 are arranged along the second direction, and the first direction and the second direction are arranged in a cross manner, wherein

[0076] W i <d i <D i ,

[0077] In the formula, d i is the relative distance between the flat ends 23 at both ends of the contact test point 2i, W i is the line width of the corresponding fine grid line 51 on the battery under test 5, and D iCorresponding to the relative distance between the fine grid line 51 and the adjacent fine grid line 51 adjacent to it, the corresponding fine grid line 51 is the fine grid line 51 on the battery 5 to be tested which is in contact with the contact test point 2i.

[0078] It can be understood that the first direction and the second direction are cross arranged, and the included angle formed between the first direction and the second direction can be a right angle, an acute angle or an obtuse angle.

[0079] In the embodiment, by setting the two ends of the contact test point 2 in the first direction as flat ends 23, the contact test point 2 forms an elongated, flat-ended, linear-like shape structure, which can better conform to the linear structure of the fine grid line 51, and when the battery 5 to be tested is placed on the elastic base 11, the fine grid line 51 is just arranged corresponding to the contact test point 2, wherein d i >W i , which can ensure that the fine grid line 51 can still be in contact with its corresponding contact test point 2 under the condition that there is a certain degree of relative offset of the fine grid line 51 in the first direction, and ensure that the electrical parameter information of each fine grid line 51 can be collected, i >d i , which can avoid short circuit caused by the contact test point 2 in the first direction being in contact with the adjacent fine grid line 51 of the opposite polarity.

[0080] The utility model discloses a flat end 23 is arranged at the two ends in the first direction, and makes W i <d i <D i , so that the shape setting and arrangement mode of the contact test point 2 can better match the fine grid line 51 of the battery 5 to be tested, and when the battery 5 to be tested is placed on the elastic base 11, the fine grid line 51 is just arranged corresponding to the contact test point 2, and a certain degree of relative offset of the fine grid line 51 in the first direction is allowed, which avoids the influence of the deviation of the fine grid line 51 printing or the deviation of the battery 5 to be tested on the smooth collection of the electrical parameter information of the fine grid line 51, and ensures that the electrical parameter information of each fine grid line 51 can be collected.

[0081] In some embodiments, as shown in Figure 10 , the contact test point 2 includes a first polarity test contact 21 and a second polarity test contact 22, the first polarity test contact 21 is used to form ohmic contact with the positive fine grid line 511 on the battery 5 to be tested, and the second polarity test contact 22 is used to form ohmic contact with the negative fine grid line 512 on the battery 5 to be tested,

[0082] The first polarity test contact 21 and the second polarity test contact 22 are staggered arranged in the first direction.

[0083] On the battery 5 to be tested, the positive fine grid lines 511 and the negative fine grid lines 512 are staggered in the first direction. By staggering the first polarity test contacts 21 and the second polarity test contacts 22 in the first direction, the contact test points 2 corresponding to adjacent positive fine grid lines 511 and negative fine grid lines 512 do not interfere with each other or come into contact to cause short circuit.

[0084] In some embodiments, referring to Figures 11 to 15 The cross section of the contact test point 2 is a polygon with at least two parallel sides.

[0085] For example, the contact test point 2 can be a rounded rectangle, a right-angled rectangle, a chamfered rectangle, a parallel polygon structure, a waist hole structure, or a polygon with asymmetric or irregular lines in the second direction, but is not limited thereto.

[0086] In some embodiments, referring to Figures 11 to 13 The cross section of the contact test point 2 is any one of a right-angled rectangle, a rounded rectangle, or a chamfered rectangle, which is convenient for manufacturing.

[0087] In some embodiments, referring to Figure 10 and Figure 16 The elastic base 11 includes a substrate, and the contact test points 2 at least partially protrude from the surface of the substrate, which can ensure stable contact between the contact test points 2 at different positions and the corresponding fine grid lines 51, and further improve the accuracy and reliability of the electrical performance parameters.

[0088] In some embodiments, referring to Figure 16 The part of the contact test point 2 protruding from the surface of the substrate forms a protruding portion 24, and the height H of the protruding portion 24 is at least 10 μm, so that the ohmic contact between the contact test points 2 at different positions and the corresponding fine grid lines 51 is more stable.

[0089] In some embodiments, referring to Figure 16 The height H of the protruding portion 24 is 10 μm to 300 μm.

[0090] For example, the height H of the protruding portion 24 is 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 180 μm, 200 μm, 220 μm, 250 μm, 280 μm, or 300 μm, but is not limited thereto.

[0091] If the height of the protruding portion 24 is too high, the material cost will be increased, and the battery 5 to be tested will be easily deformed when being pressed.

[0092] In the description of the specification, the description of the terms "some embodiments", "embodiments", "exemplary", "example", or "for example" and the like means that the specific feature, structure, material or characteristic being described in connection with an embodiment or example contains the embodiment or example. Descriptive terms of the above-mentioned terms in the specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0093] The above only is the preferred embodiment of the present application, and does not limit the present application in any form, although the present application has been disclosed as above with the preferred embodiment, however, it is not intended to limit the present application, any person skilled in the art without departing from the technical scheme of the present application, can make some changes or modifications for equivalent embodiments with the above prompted technical content, but whatever does not depart from the technical scheme of the present application, according to the technical essence of the present application, any simple modification, equivalent change and modification of the above embodiment, still belongs to the scope of the present application.

Claims

1. A gridless battery testing device, characterized in that, The device includes a test base, which comprises an elastically deformable platform. The upper surface of the platform has a three-dimensional curved structure that arches upwards from its periphery towards the center. The platform is provided with several contact test points for forming ohmic contact with the fine grid lines on the battery under test. Above the test base, there is also a flexible pressing mechanism that can be raised and lowered relative to the thickness direction of the test base. The flexible pressing mechanism includes a pressing wire mesh, which includes a plurality of parallel first pressing wires and a plurality of parallel second pressing wires. The first pressing wires and the second pressing wires are intersected to form a mesh structure.

2. The gridless battery testing device according to claim 1, characterized in that, The angle α between the upper surface of the elastic base and the horizontal plane is: α = arcsin(h / s), In the formula, α is the angle between the upper surface of the elastic base and the horizontal plane, 0.5°≤α≤6°, s is the length of the line connecting any point on the four edges of the three-dimensional curved surface structure and the highest point of the three-dimensional curved surface structure, and h is the relative height between the plane containing the four edges of the three-dimensional curved surface structure and the highest point of the three-dimensional curved surface structure.

3. The gridless battery testing device according to claim 1, characterized in that, The elastic base includes a base layer and a flexible circuit board stacked on top of each other. The upper surface of the base layer has an original three-dimensional curved surface structure that arches upward from its periphery to the center and a deformed planar shape. The contact test point is located on the flexible circuit board. The flexible circuit board has a first planar shape and a second three-dimensional curved surface structure that arches upward from its periphery to the center. The flexible circuit board is conformally attached to the upper surface of the base layer.

4. The gridless battery testing device according to claim 1, characterized in that, The flexible clamping mechanism includes a mounting frame and an adjustment component disposed on the mounting frame. The adjustment component is used to adjust the tension of the first pressure line and / or the second pressure line. The mounting frame is connected to a lifting component for driving the mounting frame to move up and down along the thickness direction of the test base.

5. The gridless battery testing device according to claim 1, characterized in that, The pressed wire mesh is made of transparent insulating material.

6. The gridless battery testing device according to claim 1, characterized in that, The mesh shape of the mesh structure can be any one of parallelogram, rectangle, or square.

7. A gridless battery testing device according to any one of claims 1 to 6, characterized in that, The elastic substrate has vacuum adsorption pores for adsorbing the battery under test.

8. A gridless battery testing device according to any one of claims 1 to 6, characterized in that, The contact test point forms straight ends at both ends in the first direction, and the straight ends extend along the second direction, wherein the first direction and the second direction intersect. W i <d i <D i , In the formula, d i W is the relative distance between the two straight ends at the contact test point i. i D represents the linewidth of the corresponding fine grid line on the battery under test. i The relative distance between the corresponding fine grid line and its adjacent adjacent fine grid line is defined as the fine grid line on the battery under test that is in contact with the contact test point i.

9. The gridless battery testing device according to claim 8, characterized in that, The cross-section of the contact test point is a polygon with at least two parallel sides.

10. A gridless battery testing device according to claim 9, characterized in that, The cross-section of the contact test point can be any one of a right-angled rectangle, a rounded rectangle, or a chamfered rectangle.

11. A gridless battery testing device according to any one of claims 1 to 6, characterized in that, The elastic base includes a substrate, and the contact test point protrudes at least partially from the surface of the substrate.

12. The gridless battery testing device according to claim 11, characterized in that, The portion of the contact test point protruding from the substrate surface forms a protrusion, the height of which is at least 10 μm.

13. The gridless battery testing device according to claim 12, characterized in that, The height of the protrusion is 10μm to 300μm.

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